如何使用@ResponseBody从spring Controller返回JSON数据

问题描述

Spring版本4.2.0，Hibernate 4.1.4
这是我的控制器功能：

@RequestMapping(value = "/mobile/getcomp", method = RequestMethod.GET)
@ResponseBody
public List<Company>  listforCompanies() {
    List<Company> listOfCompanies= new ArrayList<Company>();
    listOfCompanies = companyManager.getAllCompanies();
    return listOfCompanies;
}

杰克逊JSON映射器依赖于 Pom.xml ：

Jackson JSON mapper dependency in Pom.xml:

    <!-- Jackson JSON Mapper -->
    <dependency>
        <groupId>org.codehaus.jackson</groupId>
        <artifactId>jackson-mapper-asl</artifactId>
        <version>${jackson.version}</version>
    </dependency>

获取我的 ArrayList 中的列表，但是返回时显示以下错误：

Getting the list in my ArrayList, but when returning the following error is shown:

SEVERE: Servlet.service() for servlet [dispatcherServlet] in context with path [/IrApp] threw exception [Request processing failed; nested exception is java.lang.IllegalArgumentException: No converter found for return value of type: class java.util.ArrayList] with root cause
    java.lang.IllegalArgumentException: No converter found for return value of type: class java.util.ArrayList
        at org.springframework.util.Assert.isTrue(Assert.java:68)
        at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:124)

到我正在关注的例子。

Link to the example I'm following.

推荐答案

将以下依赖项添加到您的pom.xml：

Add the below dependency to your pom.xml:

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.5.0</version>
</dependency>

这篇关于如何使用@ResponseBody从spring Controller返回JSON数据的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！